When I worked for alexandria, a customer came in with a rt hand drive manual v6 tdi lr3. Visiting the states and needed service. Every single lr certified tech declined to work on it because they did not know what to do on a diesel.
It took the dealer about a week to get the filters then they pawn it on me... They became amazed when I made it run. USA lr certification does not cover diesel models so dealer techs are afraid of them....unless they have diesel experience before hand.

I work for one of the biggest dealers in the country, and I don't think anyone is afraid to work on a newer non-NAS truck. Give them a RRC, and that's another story (of course depending on the tech)! We have access to all of the same information that techs in the UK have, we just don't have the special tools, which probably aren't needed. The warehouse in NJ keeps a lot of random diesel parts in stock, including 300 Tdi water pumps for under $100.